"Limits" entry should not added to the root node dictionary of name trees
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Key: PDFBOX-933
URL: https://issues.apache.org/jira/browse/PDFBOX-933
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 1.4.0
Environment: Adobe Acrobat Pro v9.4.1, Windows 7 Pro x64
Reporter: Petras
Embedding file using PDComplexFileSpecification (as shown in
org.apache.pdfbox.examples.pdmodel.EmbeddedFiles example) adds "Limits" entry
to the name tree root node dictionary associated with EmbeddedFiles entry in
PDF documents name dictionary. Here is a fragment taken from the PDF document
created by EmbeddedFiles example:
...
3 0 obj
<<
/EmbeddedFiles 5 0 R
>>
5 0 obj
<<
/Limits [(My first attachment) (My first attachment)]
/Names [(My first attachment) 8 0 R]
>>
...
Such PDF document opened in Adobe Acrobat does not show embedded files in
attachments panel, unless "Limits" entry is removed or commented.
According to PDF3200:2008 specification (see clause "7.9.6 Name Trees")
"Limits" entry in name tree node dictionary can only appear in intermediate or
leaf node, but not root node.
"The tree shall always have exactly one root node, which shall contain a single
entry: either Kids or Names but not both. If the root node has a Names entry,
it shall be the only node in the tree. If it has a Kids entry, each of the
remaining nodes shall be either an intermediate node, that shall contain a
Limits entry and a Kids entry, or a leaf node, that shall contain a Limits
entry and a Names entry."
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